A) It is converted directly to chemical energy in plants.
B) It is the original source for the fuel we use in our cars and homes.
C) It can be converted directly to chemical energy by heterotrophs.
D) It is responsible for most of the warmth of our atmosphere.

A) heterotrophs.
B) monotrophs.
C) decomposers.
D) autotrophs.

A) A dodder that pierces into the phloem of its host plant to obtain nutrients
B) A mistletoe that receives energy from both photosynthesis and its host plant
C) An oak tree that receives all of its energy through photosynthesis
D) A sea slug that obtains nutrients from the algae it feeds on